kelly



(No Model.)

J. P. KELLY.

DYNAMO ELECTRIC MACHINE. No. 395,622. Patented Jan. 1, 1889.

5 ,3 F A W a F S WITNESSES: INVENTOR wg m 54 BY mmfi ltv' ATTORNEYS.

UNITED STATES PATENT OFFICE.

JOHN F. KELLY, OF NEIV YORK, N. Y., ASSIGNOR TO TIIE UNITED STATESELECTRIC LIGH'IING COMPANY, OF SAME PLACE.

DYNAMO-ELECTRIC MACHINE.

SPECIFICATION forming part of Letters Patent No. 395,622, dated January1, 1889.

Application filed July 25, 1888.

To (LZZ whom it may concern.-

Be it known that I, JOHN F. KELLY, a citizen of the United States,residingat New York, in the county and State of New York, have inventedcertain new and useful Improvements in Magnet0-Electric Machines, ofwhich the following is a specification, reterenee being had to thedrawings accompanying and forming a part of the same.

In order to prevent the overheating" of the cores and coils of thearmatures of dynamo or magneto electric machines, blowers or fans haveheretofore been used, generally secured to the armature-shaft andadapted, when the machine is running, to force a current of air throughthe spaces in the core or between the conductors. The cores of thearmature may, however, be so constructed as not to require thisartificial cooling; but in certain forms of generator, particularly inthe large-sized alternating-curreut machines as now made, the opportuuity for yenti lati on is afforded to such a limited extent that undueheating often occurs. In seeking a remedy for this trouble I havedevised a means of cooling the surface of the cores and the wires whichmay be applied not only to the machines in question, but to any othersof similar form when so desired.

My improved device consists in a series of fan-blades carried by thearmature-shaft and preferably secured to the armature and adapted tocreate and maintain along the wires on the side of the armature-core adraft of air. In illustration of my invention I have shown it as appliedto a magneto-electric machine invented by Jacob Stucky.

Figure 1 is a longitudinal central section of an armature to which myinyention is applied. Fig'. 2 is an end VlGW of the armature.

B is a shaft carrying an armature composed of a series of magneticplates, C, and the end plates, D D. The wires .E are woundlongitudinally upon the core; and F F are brass Serial No. 280,962. (Nomodel.)

l plates, which are secured to the heads l) over the wires thereon.

G G are bent blades or fans, which are socured directly to the platesl1. These blades are so formed that by the rotation of the ar mature ina given direction the blades will force the airoyer the wires E orbetween said wires and the surface of the field-magnets A A.

By this aparatus the comluctors ilQ cooled if from any causesuch as theoverloading of the machine-they become heated by the action of thecurrent.

. I usually make the blades of brass, and when applying them to theparticular machine shown I secure them directly to the plates 1 byscrews.

In applying them to other machines they maybe secured directly to theends of the armature or to suitable supports provided for them.'lheyprojccl out beyond rhearmature in a general radial direction.

\l'hal I claim is I. In an electrical generator, the combination, withan armaturc-core and conductors wound. longitudinally thereon, o1"tan-blades at the end of the core and constructed or placed in suchrelation to the core as to create a current of air alone or over theexterior of the core and coils when the armature is rotated, as setforth.

2. In an electrical generator, the combination, with field-magnets and acylindrical armature-core with longitudinally-wound conductors thereonand mounted to rotate between said magnets, of fan-blades secured to theends of the armature and constructed or placed in such relation theretoas to create a current of air along or over the exterior of the core andcoils when the armature is rotated, as set forth.

JOHN l KELLY. Witnesses:

MosEs J. DEWITT, JACOB STUCKY.

